Are you trying to do this:

text = 'example'

result = [
    text[i:len(text)-i] 
    for i in range( (len(text)+1)//2 )
]

print(result)

result:

['example', 'xampl', 'amp', 'm'] 

and if text = 'example1':

['example1', 'xample', 'ampl', 'mp']